20W-50 Synthetic Hydrostatic Transmission Fluid

Already a hit in the Omaha store! This is the result in requests for a duty specific product in mowers to increase static power in all climates and under heavy heat stress. Impressive!

High-zinc formulation fights wear and helps preserve mower speed and responsiveness.

20W-50 Synthetic Hydrostatic Transmission FluidIt fights wear and viscosity loss during continuous, severe-service operation, maximizing mower speed and operability. Unlike motor oils, Synthetic Hydrostatic Transmission Fluid is purpose-built to withstand the unique demands of hydrostatic transmissions. It lasts up to 2X original equipment manufacturer (OEM) recommendations, helping professionals save money and reduce downtime.

AMSOIL 20W-50 Synthetic Hydrostatic Transmission Fluid is specifically formulated to deliver smooth, responsive operation in zero-turn mowers, stand-on mowers and other equipment professionals rely on to make a living.

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Maximizes Mower Speed & Responsiveness

In many zero-turn mowers, oil pressure drives the wheel motors. Fluid that fails to protect against wear can cause the tight tolerances in the wheel motors to widen, which reduces oil pressure and erodes speed and responsiveness. Fluid that thins at high temperatures can have the same effect. AMSOIL Synthetic Hydrostatic Transmission Fluid contains high levels of zinc-based anti-wear additives to help maintain those tight tolerances, while its synthetic base oils naturally resist viscosity loss in extreme heat. As a result, it helps maintain mower speed and responsiveness for increased productivity.

Product Data Bulletin

Commercial-Grade Wear Protection

Transmission fluid must form a thick, durable film on gear teeth and other components to guard against metal-to-metal contact and wear. The mechanical action of meshing gear teeth, however, can tear apart – or shear – the molecular structure of the fluid, leading to viscosity loss. High heat can also cause the fluid to thin. The thinner fluid can fail to protect against wear, reducing mower life and increasing maintenance costs. AMSOIL Synthetic Hydrostatic Transmission Fluid’s naturally tough synthetic base oils resist viscosity loss due to shear and high heat, promoting the formation of a durable sacrificial anti-wear film on components that helps extend mower life.

Maintains Cleanliness

High ambient temperatures, combined with hydrostatic transmission temperatures that can exceed 230ºF, cause some conventional fluids to break down and form harmful deposits. AMSOIL Synthetic Hydrostatic Transmission Fluid features naturally heat-resistant synthetic base oils, which reduce deposits and help keep equipment clean and running properly season after season.

  • Fights wear for smooth, responsive operation
  • Purpose-built to outperform motor oils
  • Resists high heat and shear


Use in hydrostatic transmissions that require 15W-50 or 20W-50 oil recommended for API SM, SL, SJ, SH or SG, including (not limited to) those found in zero-turn, riding and stand-on mowers made by SCAG*, Toro*, Ferris*, Snapper Pro*, Gravely*, Ariens*, Exmark*, Walker*, Hustler*, Wright*, Dixie Chopper*, John Deere*, Husqvarna*, EverRide*, Bad Boy* and Cub Cadet*. Not for use in engines.


AMSOIL 20W-50 Synthetic Hydrostatic Transmission Fluid is compatible with other synthetic and conventional motor oils and transmission fluids. Mixing AMSOIL oils with other oils, however, will shorten the oil’s life expectancy and reduce its performance benefits.

Aftermarket oil additives are not recommended for use with AMSOIL transmission fluids.


AMSOIL 20W-50 Synthetic Hydrostatic Transmission Fluid is recommended for 2x original equipment manufacturer (OEM) recommendations.


AMSOIL products are backed by a Limited Liability Warranty. For complete information visit AMSOIL Warranty Information.


This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Safety Data Sheet (SDS) . An MSDS is available via the Internet at www.amsoil.com or upon request at (715) 392-7101. Keep Out of Reach of Children. Don’t pollute. Return used oil to collection centers.

*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use. All products advertised here are developed by AMSOIL for use in the applications shown.


Posted in Lawn & Landscape E-zine:

AMSOIL has added two new synthetic lubricants to its lawn and landscape product offerings to better serve landscape professionals who rely on their equipment to make a living. New AMSOIL 20W-50 Zero-Turn Synthetic Hydrostatic Transmission Fluid and new AMSOIL 10W-40 Synthetic Small-Engine Oil join AMSOIL 10W-30 Synthetic Small-Engine Oil to round out this commercial-grade product line.

AMSOIL 20W-50 Zero-Turn Synthetic Hydrostatic Transmission Fluid features a high-zinc formulation to fight wear while preserving mower speed and responsiveness. It is purpose-built to withstand the unique demands of hydrostatic transmissions to resist high-heat and shear while delivering smooth, responsive operation in zero-turn mowers, stand-on mowers and other landscaping equipment commonly used by professionals. Lasting up to two times original equipment manufacturer (OEM) recommendations, it effectively reduces maintenance costs and downtime.

Formerly known as AMSOIL Formula 4-Stroke Synthetic Small-Engine Oil, new AMSOIL Synthetic Small-Engine Oil has been updated with a new name, label and additional viscosity option. AMSOIL Synthetic Small-Engine Oil is now available in 10W-30 and 10W-40 viscosities. Both feature a robust formulation designed to preserve equipment power while fighting oil consumption caused by high heat commonly found in these applications. AMSOIL Synthetic Small-Engine Oil is formulated with premium anti-wear additives that deliver continuous severe-service protection, resulting in reduced maintenance costs and maximum equipment life.


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